Electric riveting hammer and drill



March 5, 1929. p GREENWOOD 1,703,997

ELECTRIC RIVETING HAMMER AND DRILL Filed April 27, 1927 Patented Mar. 5,1929.

UNITED STATES PAUL GREENWOOD, WEST HAVEN, CONNECTICUT.

ELECTRIC BIVETING HAMMER AND DRILL.

1 Application filed April 27, 1927. Serial No. 187,083.

The present invention relates to an electric riveting hammer and drilland. has for its rime object to provide an armature member slidablymounted in a frame and electromagnets associated therewith whereby thearmature may be vibrated for reciprocating a tool such as a hammer ordrill.

Another very important object of the invention resides in the provisionof a structure as just indicated in combination with an automaticallycontrolled switch structure for properly energizing the magnet to attainthe desired reciprocation'of the armature and the tool.

A still further important object of the invention resides in theprovision of a. device of this nature which is simple in itsconstruction, inexpensive to manufacture, thoroughly efiicient andreliable in its operation, and otherwise well adapted to the purpose forwhich it is designed.

With the above and numerous other objects in view as will appear as thedescription proceeds, the invention resides in certain novel 2 featuresof construction, and in the combination and arrangement of parts as willbe hereinafter more fully described and claimed.

In the drawing:

The figure is a sectional elevation of the device embodying the featuresof this invention.

Referring to the drawing in detailit will be seen that the numeral 5denotes a rectangular frame. Rising from the lower end of the frame is atube 6 in-which is slidably mounted a bar 7 held normally in an upwardosition by a spring 8 in the tubular memer abutting a shoulder 9 on therod. Suitable tool engaging socket means or the like 10 is mounted onthe lower end of the rod 7. An armature 11 is mounted on the upper endthereof. An electro-magnet 12 is mounted in the upper end of the framein any suitable manner. A pair of electro-magnets 14 are mounted in thelower portion of the frame one to each side of the tubular member 6 inan suitable manner and the armature 11 is isposed betweenelectro-magnets 14 and the electro-magnet 12. A switch box 16 is mountedon a bracket 17 fixed to one electro-magnet 14 to be disposed adjacentone side of the frame 5 and has fixed contacts 19, 20 and 21 therein. Amember 22 is pivotally mounted intermediate its ends as at 23 in theswitch box 15 and is electrically engaged with contact 20 and adapted toengage either contact 19 and contact 21. Projections 24 are formed onthe member 22 to be engaged by a roller 25 on the armature 11. A masterswitch is shown at 26 andhas wires 27 and 28 leading therefrom. Thecurrent will flow through the wire 28, contact 20, switch member 22,contact 21, through wire 30, electro-magnet 12, through wire 31 to wire27 thus energizing electro-magnet 12 to raise the armature and when thearmature is raised the roller 25 will hit the upperprojection 24 toswing the switch member 22 to engage the contact 19 so that the currentfrom the wire 28 will no longer fiow through the electro-magnet 12, butwill flow through contact 19, and wire 32 through the electro-magnets 14and return through wire 33'which merges into wire 27, thus energizinelectro-magnets 14 to pull down quic y on the armature 11. Thus it willbe seen that the rod 7 and the tool socket 10 may be reciprocated foroperating a hammer, drill, or the like.

It is thought that the construction, operation, utility, and advantagesof this invention will now be quite apparent to those skilled in thisart without a more detailed description thereof. The present embodi-fment of the invention has been disclosed in detail merely by way ofexample since in actual practice it attains the features of advantageenumerated as desirable in the statementof the invention and the abovedescription. It will be apparent that changes in the details ofconstruction, and in the combination and arrangement of parts may beresorted to without departing from the spirit or scope of the inventionas hereinvantages.

Having thus described my invention, what I claim as new is An electricriveting and drilling apparatus after claimed or sacrificing any of itsad- ,side of the frame in circuit with the elecsame so as to properlyenergize the electro-,

tromagnets, a rod slidable through the guide, magnets to causereciprocation of the armaan armature across the inner end of the rodture and rod, and sprlng means in the guide, 1 and extending between thefirst mentioned urging the rod in a dlrection to move the 1 5 magnet andsaid pair of magnets, and havarmature from said pair of magnets. 4 inga, roller on one end engageable with the In testimony whereof I afiix mysi ature. circuit closer and breaker to operate the PAUL GREENW OD.

